Source Localization of Induced Cortical Oscillations During Tactile Finger Stimulation - Quellokalisation von induzierten Gehirnoszillationen bei taktiler Fingerstimulation

We investigated the EEG beta event-related synchronization (ERS) after tactile finger stimulation in three subjects. Prior studies from our group using electrical stimulation and self-paced movement showed a beta rebound within one second after stimulation respectively movement offset. As the tactile-stimulation-data showed a similar ERS behaviour, we extracted the cortical sources for this beta rebound by the linear estimation method in order to see whether the representation areas of different fingers were distinguishable (as is possible with MEG data). Although realistic head models of two subjects were used for the calculations the fingers could not be spatially distinguished. However, regarding the whole spatio-temporal pattern of the ERS for different fingers clear differences can be observed.

[1]  W W Sutherling,et al.  Functional anatomy of human hand sensorimotor cortex from spatiotemporal analysis of electrocorticography. , 1991, Electroencephalography and clinical neurophysiology.

[2]  Mark Hallett,et al.  Time course of corticospinal excitability in reaction time and self‐paced movements , 1998, Annals of neurology.

[3]  R. Hari,et al.  Spatiotemporal characteristics of sensorimotor neuromagnetic rhythms related to thumb movement , 1994, Neuroscience.

[4]  Christa Neuper,et al.  Post-movement synchronization of beta rhythms in the EEG over the cortical foot area in man , 1996, Neuroscience Letters.

[5]  H. Akaike.  A new look at the statistical model identification , 1974 .

[6]  G. Pfurtscheller,et al.  Functional imaging of postmovement beta event-related synchronization. , 1999, Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society.

[7]  G Pfurtscheller,et al.  Event-related beta synchronization after wrist, finger and thumb movement. , 1998, Electroencephalography and clinical neurophysiology.

[8]  P. Hansen.  Numerical tools for analysis and solution of Fredholm integral equations of the first kind , 1992 .

[9]  W. Penfield,et al.  SOMATIC MOTOR AND SENSORY REPRESENTATION IN THE CEREBRAL CORTEX OF MAN AS STUDIED BY ELECTRICAL STIMULATION , 1937 .

[10]  R Llinás,et al.  Anatomical localization revealed by MEG recordings of the human somatosensory system. , 1991, Electroencephalography and clinical neurophysiology.

[11]  R. Lesser,et al.  Functional mapping of human sensorimotor cortex with electrocorticographic spectral analysis. I. Alpha and beta event-related desynchronization. , 1998, Brain : a journal of neurology.

[12]  W. Penfield.  The Cerebral Cortex of Man , 1950 .

[13]  R. Lesser,et al.  Functional mapping of human sensorimotor cortex with electrocorticographic spectral analysis. II. Event-related synchronization in the gamma band. , 1998, Brain : a journal of neurology.

[14]  G. Pfurtscheller,et al.  Motor imagery activates primary sensorimotor area in humans , 1997, Neuroscience Letters.

[15]  R. Hari,et al.  Functional Segregation of Movement-Related Rhythmic Activity in the Human Brain , 1995, NeuroImage.

[16]  C. Woolsey,et al.  Localization in somatic sensory and motor areas of human cerebral cortex as determined by direct recording of evoked potentials and electrical stimulation. , 1979, Journal of neurosurgery.

[17]  F. L. D. Silva,et al.  Event-related EEG/MEG synchronization and desynchronization: basic principles , 1999, Clinical Neurophysiology.

[18]  C. C. Wood,et al.  Localization of human sensorimotor cortex during surgery by cortical surface recording of somatosensory evoked potentials. , 1988, Journal of neurosurgery.

[19]  G. Pfurtscheller,et al.  Event-related cortical desynchronization detected by power measurements of scalp EEG. , 1977, Electroencephalography and clinical neurophysiology.